IMPACTO Air Belt®Lumbar Support Features unique patented inflatable air technology. Multi-celled air chambers conform to the back when air is added to provide relief from back pain. Moisture absorbing inner lining and nylon outer cover. Extended web with adjustable hook and loop closure fits two convenient sizes.#APSM - fits waist 25" to 35"#APLXL - fits waist 36" to 50"
To determine sizing use waist measurement and add 2" if belt is worn over clothing. For LS, DIP & DUAL use hip measurement.